3 * Copyright (C) 1999, 2004 Manfred Spraul
5 * This file is released under GNU General Public Licence version 2 or
6 * (at your option) any later version.
8 * See the file COPYING for more details.
11 #include <linux/spinlock.h>
12 #include <linux/init.h>
13 #include <linux/security.h>
14 #include <linux/slab.h>
15 #include <linux/ipc.h>
16 #include <linux/ipc_namespace.h>
17 #include <asm/uaccess.h>
21 DEFINE_SPINLOCK(mq_lock);
24 * The next 2 defines are here bc this is the only file
25 * compiled when either CONFIG_SYSVIPC and CONFIG_POSIX_MQUEUE
26 * and not CONFIG_IPC_NS.
28 struct ipc_namespace init_ipc_ns = {
29 .count = ATOMIC_INIT(1),
30 .user_ns = &init_user_ns,
33 atomic_t nr_ipc_ns = ATOMIC_INIT(1);
36 struct msg_msgseg* next;
37 /* the next part of the message follows immediately */
40 #define DATALEN_MSG (PAGE_SIZE-sizeof(struct msg_msg))
41 #define DATALEN_SEG (PAGE_SIZE-sizeof(struct msg_msgseg))
43 struct msg_msg *load_msg(const void __user *src, int len)
46 struct msg_msgseg **pseg;
51 if (alen > DATALEN_MSG)
54 msg = kmalloc(sizeof(*msg) + alen, GFP_KERNEL);
56 return ERR_PTR(-ENOMEM);
61 if (copy_from_user(msg + 1, src, alen)) {
67 src = ((char __user *)src) + alen;
70 struct msg_msgseg *seg;
72 if (alen > DATALEN_SEG)
74 seg = kmalloc(sizeof(*seg) + alen,
82 if (copy_from_user(seg + 1, src, alen)) {
88 src = ((char __user *)src) + alen;
91 err = security_msg_msg_alloc(msg);
102 int store_msg(void __user *dest, struct msg_msg *msg, int len)
105 struct msg_msgseg *seg;
108 if (alen > DATALEN_MSG)
110 if (copy_to_user(dest, msg + 1, alen))
114 dest = ((char __user *)dest) + alen;
118 if (alen > DATALEN_SEG)
120 if (copy_to_user(dest, seg + 1, alen))
123 dest = ((char __user *)dest) + alen;
129 void free_msg(struct msg_msg *msg)
131 struct msg_msgseg *seg;
133 security_msg_msg_free(msg);
137 while (seg != NULL) {
138 struct msg_msgseg *tmp = seg->next;